var momObj = function() //大鱼
{  
	this.x;
	this.y;
	this.angle;
	this.bigEye = new Image();  
	this.bigBody = new Image(); 
	this.bigTail = new Image();

	this.momTailTimer=0;
	this.momTailCount=0;

	this.momEyeTimer=0;
	this.momEyeCount=0;
	this.momEyeInterval=1000;

	this.momBodyCount=0;

}
momObj.prototype.init = function()
{  
	this.x = canWidth * 0.5;   
	this.y = canHeight * 0.5;  
	this.angle=0;
	//this.bigEye.src = "./src/bigEye0.png"; 
	//this.bigBody.src = "./src/bigSwim0.png";   
	//this.bigTail.src = "./src/bigTail0.png";
}
momObj.prototype.draw = function()
{  
	//lerp x,y
	this.x=lerpDistance(mx,this.x,0.99);
	this.y=lerpDistance(my,this.y,0.99);

	//delta angle
	//Math.atan2(y,x)
	var deltaY=this.y-my;
	var deltaX=this.x-mx;
	var beta=Math.atan2(deltaY,deltaX);

	//lerp angle
	this.angle=lerpAngle(beta,this.angle,0.6);

	this.momTailTimer+=deltaTime;
	if(this.momTailTimer>50)
	{
		this.momTailCount=(this.momTailCount+1)%8;
		this.momTailTimer%=50;
	}

	this.momEyeTimer+=deltaTime;
	if(this.momEyeTimer>this.momEyeInterval)
	{
		this.momEyeCount=(this.momEyeCount+1)%2;
		this.momEyeTimer%=this.momEyeInterval;
		if(this.momEyeCount==0)
		{
			this.momEyeInterval=Math.random()*1500+2000;
		}else{
			this.momEyeInterval=200;
		}
	}

	ctx1.save();   
	ctx1.translate(this.x,this.y); 
	ctx1.rotate(this.angle);
	var momTailCount=this.momTailCount;
	ctx1.drawImage(momTail[momTailCount], -momTail[momTailCount].width*0.5 + 30, -momTail[momTailCount].height*0.5); 
	var momBodyCount=this.momBodyCount;
	if(data.double==1){
		ctx1.drawImage(momBodyOra[momBodyCount], -momBodyOra[momBodyCount].width*0.5, -momBodyOra[momBodyCount].height*0.5); 
	}else{
		ctx1.drawImage(momBodyBlue[momBodyCount], -momBodyBlue[momBodyCount].width*0.5, -momBodyBlue[momBodyCount].height*0.5); 
	}
	var momEyeCount=this.momEyeCount;
	ctx1.drawImage(momEye[momEyeCount],-momEye[momEyeCount].width*0.5,-momEye[momEyeCount].height*0.5);


	ctx1.restore();
}